I dont think him saying "I wont let her get away" is creppy - if any of your bfs/husbands said that (and I mean the general you, not anyone specifically), it would be endearing.. I think he means that she's just a catch, an amazing woman and he doesnt want to lose her.
And as for her saying "I always knew I'd marry Tom Cruise"... what girl her age didn't have the BIGGEST CRUSH EVER on Tom Cruise when they were younger?
I dont like that people blow the smallest things out of proportion.
Not to say he isn't completely unhinged.. I'm just saying, little things like that are cute, not creepy/